I have a Gen 1, the zipper bolt and inconsistent feeding issues annoyed me, but it always shot absolutely lights out for me. Took some 1000 and 2000 grit sandpaper to the bolt, put it in a cheap Trybe chassis and that thing is my favorite gun now. Oh, and swapped out the magazine for a metal Ruger one and haven’t had one feeding issue since. I got it for $32 ish after rebate, the Trybe chassis for $150, I think you would be hard-pressed to find a rifle that out shoots it for $500.
I’m thinking of picking up a 223 Gen II for cheap plinking